Features
- Support SIP 2.0 (RFC3261) and correlative RFCs
- Support IAX2
- Codecs: G.711a/u, G.723.1 high/low, G.729 and G.722 (HD Voice)
- Echo cancellation: Supports G.168, and Hands-free can support 96ms
- Supports Voice Gain Setting, Jitter Buffer, VAD, CNG
- Full duplex hands-free speaker phone
- NAT transverse: supports STUN client
- Supports SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer / IP call
- SIP support Pubic & Private server. Can connect to Public SIP and Private SIP server at the same time
- DTMF: Support SIP info, DTMF Relay, RFC2833
- SIP application: supports Call forward / transfer / holding / waiting
- Call control features: Flexible dial map, Hotline, Empty calling reject
- Black list for rejecting authenticated call, limit call, Do Not disturb, Caller ID.
- Supports 3-way conference call
- Voice recording: 240 seconds max or 3 records max, or user-defined record prompt with 1 minute max
- Internal Phone Book: 500 records of storage
- Incoming calls / Outgoing calls / Missed calls. Each supports 100 records
- Conference and voice record on SIP server
- Choose from 8 different ring types
- English, Spanish and Czechoslovakian Language Support

Network Features
- WAN/LAN: Support Bridge and Router model
- Supports basic NAT and NAPT
- Supports PPPoE for xDSL
- Supports DHCP Client on WAN
- Supports DHCP Server on LAN
- Supports VLAN (optional: voice vlan/data vlan)
- QoS with DiffServ
- Supports DMZ
- Supports VPN (L2TP/UDP TUNNEL)
- Supports DNS Relay, SNTP Client, Firewall
- Network tools in telnet server: Including ping, trace route, telnet client
- Web ,telnet and keypad management
- Management with different account rights
- Upgrade firmware through POST mode
- Upgrade firmware through HTTP, FTP or TFTP
- Telnet remote management / Upload/download setting file
- Support Auto Provisioning (upgrade firmware or configuration file)
- Support Syslog

Additional Specifications
Adapter(Input/Output): 50~60HZ 110~240V / 5V 1A
WAN: 10/100Base-T RJ-45 for LAN
LAN: 10/100Base- T RJ-45 for PC
Power Consumption Idle: 1.5W active:1.8W
LCD size: 3 in.(70 x 33mm)
Main Chipset: INFINEON IFX21553(MIPS32:150M,DSP:100M)
SDRAM: 64Mbits
Flash: 16Mbits
Dimension(W×H×D): 9×7.5×4 in. (295×205×75mm)
Weight: 1.98lbs (0.9kg)